lead type transformerIt is an electrical device that changes voltage. It plays a very important role in life and industry. Therefore, its performance in all aspects has attracted widespread attention. In order to maintain the comprehensive performance of the transformer, we must consider its allowable temperature rise and its impact on performance. Today we will understand the causes of transformer temperature rise.
First of all, we need to know what is the temperature rise of the transformer? Temperature rise is the difference between the transformer temperature and the ambient temperature.
So, what is the reason for the transformer temperature rise? The temperature rise has nothing to do with the ambient temperature, only the loss and heat dissipation capacity of the transformer. Transformer losses include core losses and coil copper losses. In the operation of the transformer, due to hysteresis loss, eddy current loss of the iron core and copper loss of the coil, the iron core and the coil are converted into heat, which causes the internal temperature of the transformer to rise. However, because the temperature inside the transformer is higher than the temperature of the surrounding environment, heat will be dissipated from the inside of the transformer. As the heat inside the transformer rises, the heat dissipation will be faster. While the heat is dissipated to the outside, the temperature of the transformer will also be maintained at a certain fixed value, so as to achieve a thermally stable state of internal heat and external heat dissipation. At this time, the difference between the actual temperature of the transformer and the ambient temperature is called the temperature rise of the transformer.
The temperature increase is also related to the heat dissipation area. The larger the heat dissipation area of the transformer coil and iron core, the lower the temperature rise of the transformer.
Well, through the previous introduction, everyone understands the reason for the transformer temperature rise. In daily transformer design, reducing the working magnetic induction intensity of the iron core and selecting low-loss iron core materials are the main means to reduce the iron core loss. Reducing the current density of the coil and increasing the cross-sectional area of the wire are the main means to reduce the copper loss of the coil. But these are closely related to the size and cost of the transformer. Proper adjustment of the line loss and iron loss ratio can optimize the technical, economic indicators and temperature rise of the transformer.